CN210297235U - Automatic close neutral point earthing switch device who divides - Google Patents
Automatic close neutral point earthing switch device who divides Download PDFInfo
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- CN210297235U CN210297235U CN201921420451.5U CN201921420451U CN210297235U CN 210297235 U CN210297235 U CN 210297235U CN 201921420451 U CN201921420451 U CN 201921420451U CN 210297235 U CN210297235 U CN 210297235U
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- neutral point
- generator set
- direct current
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model relates to a ground connection electric wire field just discloses an automatic close neutral point earthing switch device who divides, and this neutral point earthing switch device mainly controls the neutral point and carries out ground connection through ground resistance when realizing that generating set starts, and guarantees that there is the neutral point ground connection of just only a generating set when many generating set parallel operation. The utility model discloses in, increase a direct current contactor between neutral point and ground resistance, alright realize that the simultaneous control neutral point that generating set started carries out ground connection through ground resistance, and guarantee that there is and only a generating set's neutral point ground connection when many generating set parallel operation. The neutral point of the generator set can be reliably grounded when a single generator set operates in a parallel mode, and the neutral point of only one generator set is grounded when a plurality of generator sets operate in a parallel mode, so that the phenomenon that harmonic circulation is generated to reduce the performance of the generator set and damage to electric equipment is caused by overhigh overvoltage value is avoided.
Description
Technical Field
The utility model relates to a ground connection electric wire field especially relates to an automatic close neutral point earthing switch device who divides.
Background
Along with the rapid development of the Chinese industry, the capacity of domestic electric equipment is continuously enlarged, the capacity of a diesel engine unit serving as a standby power supply is also continuously increased, and sometimes even a plurality of high-power diesel engine units are connected in parallel to meet the use requirement. The voltage is also increased from the usual 400V to 6300V or 10500V. At the moment, the high-voltage diesel generator set is produced at the right moment, and the requirement of domestic and foreign high-voltage electric equipment is timely met.
In order to reduce the overvoltage value of the high-voltage diesel generator set system and avoid the damage to equipment caused by overhigh voltage value, the neutral point of the high-voltage diesel generator set is grounded through a grounding resistor cabinet. The neutral point of a single high-voltage diesel generator set can be directly grounded, but a plurality of high-voltage generator sets run in parallel, and triple harmonic circulation can be generated due to unbalanced active or reactive load distribution or unbalanced degree of three-phase load of the plurality of generator sets. The third harmonic circulation on the neutral point grounding resistor can heat the generator set and reduce the output of the diesel generator set, so that limitation is needed. Therefore, the device is provided, namely, a controllable alternating current contactor is added between the neutral point of the diesel generator set and the grounding resistor, when the high-voltage diesel generator set operates independently, the unit control device 1 gives a neutral point switching-on command to control the alternating current contactor to be switched on and carry out neutral point grounding; when a plurality of units run in parallel, the unit control device 1 of the high-voltage diesel generator set which is started successfully firstly gives a closing command of the alternating current contactor, controls the neutral point to be grounded, and prohibits the high-voltage diesel generator set control device 1 which is started later through communication to send the closing command of the alternating current contactor. Therefore, the neutral points of a plurality of high-voltage diesel generating sets can be prevented from being grounded simultaneously, only the neutral point of the set which is started successfully firstly is grounded, and the generation of third harmonic circulation is limited.
In view of the above, the utility model provides an automatic close neutral point earthing switch device who divides can be when many high-pressure diesel generating set parallel operation, and automatic close neutral point earthing switch device accessible communication interlocking and the signal processing technique of dividing guarantee many high-pressure diesel generating set parallel operation, have and only the neutral point ground connection of a unit, avoid many high-pressure diesel generating set neutral point ground connection simultaneously to produce the third harmonic circulation.
SUMMERY OF THE UTILITY MODEL
The utility model discloses solve the technical problem that above-mentioned prior art exists, provide an automatic close neutral point earthing switch device who divides.
In order to realize the above-mentioned purpose, the utility model discloses a following technical scheme, an automatic close neutral point earthing switch device who divides, including DC220V DC power supply, direct current contactor, unit controlling means and ground resistor, DC220V DC power supply passes through electric connection with direct current contactor, and direct current contactor's the other end passes through electric connection with unit controlling means, and is two sets of electric connection has CAN communication bus between the unit controlling means, direct current contactor's right-hand member and ground resistor electric connection.
The DC220V direct-current power supply supplies power to a coil of the direct-current contactor, the multifunctional unit control device sends a switching-on/off signal to the direct-current relay by judging the state of the generator unit, the direct-current contactor is closed to ground a neutral point of the generator unit through the grounding resistor, and a direct-current contactor closing feedback signal is fed back to the unit control device, so that closed-loop control of the whole neutral point grounding system is formed.
The unit control device sends a switching-on/off signal to the direct current relay by judging the state of the generator set.
Preferably, when the generator set is in stand-alone operation, the generator set is started to operate, and the generator set control device sends a closing signal to the direct current contactor.
Preferably, the dc contactor is closed to ground a neutral point of the generator set through a ground resistor, and the auxiliary contact of the dc contactor returns a closing feedback signal to the generator set controller.
Preferably, when the generator sets are operated in parallel, the first generator set is started to operate, the neutral point grounding switch device is consistent with the single-machine operation state, and when a closing feedback signal of the direct current contactor of the first generator set is received.
Preferably, the unit control device performs signal operation processing, and does not send a closing signal of the neutral point direct current contactor when the subsequent parallel running generator set is started.
Advantageous effects
The utility model provides an automatic close neutral point earthing switch device who divides. The method has the following beneficial effects:
(1) the automatic switching on/off neutral point grounding switch device has the advantages that by means of the strong signal operation processing capacity of the unit control device, the direct current contactor is additionally arranged between the neutral point and the grounding resistor, the neutral point is controlled to be grounded through the grounding resistor while the generator set is started, and the fact that the neutral point of only one generator set is grounded when a plurality of generator sets are in parallel operation is guaranteed. The neutral point of the generator set can be reliably grounded when a single generator set operates in a parallel mode, and the neutral point of only one generator set is grounded when a plurality of generator sets operate in a parallel mode, so that the phenomenon that harmonic circulation is generated to reduce the performance of the generator set and damage to electric equipment is caused by overhigh overvoltage value is avoided.
(2) According to the scheme, under the condition that the appearance structure and the overall design of a machine set are not changed, only one direct current contactor is added in an original grounding resistance cabinet, and the action power supply of the direct current contactor is equal to the original high-voltage output cabinet DC220V power supply. The switching-on and switching-off control signal and the locking signal of the direct current contactor are also from a unit control device originally configured for the high-voltage diesel generator set. Therefore, the utility model has the advantages of only increasing the condition of a direct current contactor, utilizing the equipment of original unit, alright provide an automatic neutral point earthing switch device who closes the branch to reach the effect of practicing thrift the space.
Drawings
FIG. 1 is a flow chart of the present invention;
fig. 2 is the automatic switching schematic diagram of the neutral point grounding switch of the present invention.
Illustration of the drawings:
1 unit control device, 2 direct current contactors, 3 grounding resistors, 4 DC220V direct current power supply and 5 CAN communication buses.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.
Example (b): an automatic switching-on/off neutral point grounding switch device is shown in fig. 1-2 and comprises a DC220V direct-current power supply 4, a direct-current contactor 2, a unit control device 1 and a grounding resistor 3, wherein the DC220V direct-current power supply 4 is electrically connected with the direct-current contactor 2, the other end of the direct-current contactor 2 is electrically connected with the unit control device 1, a CAN communication bus 5 is electrically connected between the two sets of unit control devices 1, and the right end of the direct-current contactor 2 is electrically connected with the grounding resistor 3.
The DC220V direct current power supply 4 supplies power to a coil of the direct current contactor 2, the multifunctional unit control device 1 sends a switching-on/off signal to the direct current relay by judging the state of the generator set, the direct current contactor 2 is closed to ground the neutral point of the generator set through the grounding resistor 3, and a direct current contactor 2 closing feedback signal is returned to the unit control device 1, so that closed-loop control of the whole neutral point grounding system is formed.
The unit control device 1 sends a switching-on/off signal to the direct current relay by judging the state of the generator set.
When the generator set is in single-machine operation, the generator set control device 1 sends a closing signal to the direct current contactor 2 when the generator set is started to operate, the direct current contactor 2 is closed to enable a neutral point of the generator set to be grounded through a grounding resistor, and an auxiliary contact of the direct current contactor 2 returns a closing feedback signal to the generator set control device 1.
When the generator sets are in parallel operation of multiple generators, the first generator set is started to operate, meanwhile, the neutral point grounding switch device is consistent with the single generator operating state, when a switching-on feedback signal of the direct current contactor 2 of the first generator set is received, the generator set control device 1 carries out signal operation processing, and when the subsequent generator sets in parallel operation are started, the neutral point direct current contactor 2 is not sent.
The high-voltage diesel generator set receives an external starting signal at the same time, after the unit control device 1 of the high-voltage diesel generator set which is successfully started firstly detects that the high-voltage diesel generator set is successfully started, a closing signal is sent to the direct current contactor 2, a coil of the direct current contactor 2 is connected with the DC220V direct current power supply 4, the direct current contactor 2 is closed, and the high-voltage diesel generator set is grounded through the grounding resistor 3 to protect high-voltage equipment. The direct current contactor 2 is switched on and simultaneously feeds back a switching-on signal to the unit control device 1, and the unit control device 1 prohibits the subsequent unit control device 1 from sending a switching-on command to the direct current contactor 2 through the CAN communication bus 5 after receiving the switching-on feedback signal of the direct current contactor 2. Therefore, when a plurality of high-voltage diesel generating sets run in parallel, the neutral point of only one high-voltage diesel generating set is grounded, so that the phenomenon that the performance of the generating sets is reduced by harmonic circulation and the damage to electric equipment caused by overhigh overvoltage value is avoided.
The utility model discloses a theory of operation: firstly, according to the grounding current and the through-current time of the high-voltage diesel engine set, a corresponding grounding resistor 3 is selected. And a controllable direct current contactor 2 is additionally arranged between the neutral point of the high-voltage diesel generator set and the grounding resistor 3, and in order to provide power for the direct current contactor 2, a set of direct current DC220V power supply is required to be additionally arranged, and the power supply provides operation power for the high-voltage output cabinet. The closed-loop control of the closing and opening of the direct current contactor 2 is completed by the unit control device 1, and when a plurality of high-voltage diesel generating sets are operated in parallel, the control devices of the units are communicated through a CAN bus. When a plurality of high-voltage diesel engine sets are operated in parallel and simultaneously obtain a starting command, the set control device 1 which is started firstly sends a neutral switch closing signal, the direct current contactor 2 receives the command closing and feeds back a closing position signal to the set control device 1, and after the set control device 1 receives the position feedback signal of the direct current contactor 2, the high-voltage diesel engine generator set control device 1 which is started subsequently is forbidden to send a closing signal to the direct current contactor 2 through CAN bus communication. The purpose that when a plurality of high-voltage diesel generating sets are operated in parallel, the neutral point of only one set is grounded is achieved.
Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above-described embodiments, and many modifications are possible. Any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should be considered as belonging to the protection scope of the present invention.
Claims (4)
1. An automatic neutral point earthing switch device that closes branch, includes DC220V direct current power supply (4), direct current contactor (2), unit controlling means (1) and ground resistor (3), its characterized in that: DC220V DC power supply (4) and DC contactor (2) are through electric connection, and the other end and unit controlling means (1) of DC contactor (2) are through electric connection, and are two sets of electric connection has CAN communication bus (5) between unit controlling means (1), the right-hand member and the ground resistor (3) electric connection of DC contactor (2), DC220V DC power supply (4) provide the power for DC contactor (2) coil, and multi-functional unit controlling means (1) send for DC relay through judging the generating set state closes the branch brake signal, and DC contactor (2) closure is earthed through ground resistor (3) with the neutral point of generating set to return a DC contactor (2) closure feedback signal to unit controlling means (1), form the closed-loop control of whole neutral point ground system.
2. An automatic make-and-break neutral grounding switch apparatus as claimed in claim 1, wherein: the unit control device (1) sends a switching-on/off signal to the direct current relay by judging the state of the generator set.
3. An automatic make-and-break neutral grounding switch apparatus as claimed in claim 1, wherein: when the generator set is in single-machine operation, the generator set is started to operate, meanwhile, the generator set control device (1) sends a closing signal to the direct current contactor (2), the direct current contactor (2) is closed to enable a neutral point of the generator set to be grounded through a grounding resistor, and an auxiliary contact of the direct current contactor (2) returns a closing feedback signal to the generator set control device (1).
4. An automatic make-and-break neutral grounding switch apparatus as claimed in claim 1, wherein: when the generator sets are operated in parallel, a first generator set is started to operate, and meanwhile, the neutral point grounding switch device is consistent with the operating state of a single generator, when a switching-on feedback signal of a direct current contactor (2) of the first generator set is received, the generator set control device (1) performs signal operation processing, and when the subsequent generator sets operated in parallel are started, the switching-on signal of the direct current contactor (2) of the neutral point is not sent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921420451.5U CN210297235U (en) | 2019-08-29 | 2019-08-29 | Automatic close neutral point earthing switch device who divides |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921420451.5U CN210297235U (en) | 2019-08-29 | 2019-08-29 | Automatic close neutral point earthing switch device who divides |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210297235U true CN210297235U (en) | 2020-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921420451.5U Active CN210297235U (en) | 2019-08-29 | 2019-08-29 | Automatic close neutral point earthing switch device who divides |
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| Country | Link |
|---|---|
| CN (1) | CN210297235U (en) |
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2019
- 2019-08-29 CN CN201921420451.5U patent/CN210297235U/en active Active
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